Dust collar for gyratory crushers



W. S WESTON DUST COLLAR FOR GYRATORY CRUSHERS Filed July 18, 1922gwoe'nioz Patented Oct. 12, 19.26.

UNITED STATES 1,602,733 PATENT OFFICE.

WILLIAM S. WESTON, OF COLUMBIA, SQUTH CAROLINA.

DUST COLLAR FOR GYRATORY GBUSHERS.

Application filed July 18, 1922, isc rial No. 575,861.

The present invention relates to gyratory crushing machines andparticularly to devices for excluding dust and dirt from the socket inwhich the gyratory shaftis supported.

The crushing shaft of the usual gyratory crushing machine is of largesize and great weight and the entire weight of this shaft is supportedin a single bearing, located either at the top of the machine or at thebottom. It is essential to provide means for preventing the entrance ofdust and dirt into the socket in which the shaft end is mounted inasmuchas such foreign abrasive material will rapidly wear out the shaft endand the walls of the socket, thus causing looseness of the shaft andnoise in operation and resulting in the necessity of frequent'cleaningor repair.

The objectof this invention is to provide a dust excluding device ofthis character which is particularly adapted to be used with a gyratoryshaft which is supported at its lower end. Such a shaft bearing is incertain types of machines, constantly surrounded by clouds of dust andstreams of rock and grit falling from the crushing hopper to thereservoir beneath the machine. It is necessary therefore to provide athoroughly effective means for preventing the entrance of dirt into theshaft supporting socket and one which is durable and capable of standingconsiderable mechanical shock due to the possible impact of fragments ofstone.

The invention may be embodied in different ways and adapted fordifferent forms of machines and in the accompanying drawings oneembodiment is illustrated by way of ex ample.

The drawing is a longitudinal section through a gyratory crushingmachine of the type described and illustrated in my copendingapplication, Serial No. 456,663 filed March 29, 1921, showing theimproved dust excluding device incorporated therewith.

The frame of the machine has a central cylindrical portion 11 at itslower end and secured thereto by arms 11 which portion hasan axialcylindrical aperture or socket 12 therein to receive the lower end ofthe gymtory shaft 13. The lower end of this shaft is tapered as shownand fits snugly within the correspondingly tapered recess 14 of a cap 15which takes allof the wear due to the downward thrust of the shaft anddue to its lateral thrust in gyrating. This cap is removableandreplaceable so that when it has become worn a new cap may be placed onthe end of the shaft. The cylindrical aperture 12 is provided with abushing 16 which flares both ways from the center of gyration and thecap 15 fits closely within the restricted neck of this bushing. Theshaft is supported by an adjustable plug 17 upon the upper surface ofwhich the cap 15 rests and is gyrated about a center 18 by means ofmechanism at its top which is fully described in my copendingapplication above mentioned the stone being crushed between the concave19 of the crushing hopper and the conical mantle 20 rigidly supported onI the shaft.

The upper surface 21 of member 11 is an nular andhorizontally orsubstantially horizontally disposed. Slidably. resting upon thissurface21 is a ring 22 preferably of substantially triangular crosssection as shown, this ring having a cylindrical inner surface 23 and asphericalouter surface 24 which is centered about the point 18. A sleevemember 25 is positioned above the ring 22 and is provided with a lowersurface 26 which is also spherical and centered about thepoint 18 sothat the surfaces 24 and 26 respectively. of the ring and sleeve are incontinuous contact with each other; The sleeve 25 has a cylindricalinner surface 27 fitting closely around the cylindrical outer surface ofcap 15 and has a concentric cylindrical outer surface 28 which isengaged by the cylindrical inner surface of the downwardly and inwardlyturned flange 29 projecting from the upper edge of cap 15.

The sleeve 25 is vertically movable relatively to the cap 15 butnormally rests on ring 22, fitting tightly against the ring owing to itsconsiderable weight. q

The oiling system of the/machine, includes a pipe 30 for introducing oilunder some pressure into the socket in which the lower end of shaft 13rests. The pressure is sufli cient to cause oil to pass upwardly alongthe cap 15 and to seep out through the joints between the ring 22, andmember 11, and through the joints between the sleeve 25, the cap 15, andthe ring. It also makes its way into the annular space 31 and'seepsoutbetween the cylindrical surface 28 of sleeve 25 and the adjacent annularsurface of the flange 29 which fits t-hereagainst.

In operation the ring 22 will slide laterally upon its supportingsurface 21 as the shaft gyrates, the sleeve 25 causing this slidingmovement of the ring inasmuch as it positively engages the ring on allsides and moves with the shaft. A sliding movement occurs between thesleeve 25 and ring 22, the spherical surfaces of these members movingrelatively a slight distance, and a slight vertical movement of thesleeve 25 relative to the cap 15 will occur. The bearing surfaces are,however, well lubricated in the manner pointed out and substantially nowear takes place between the several parts mentioned. Seepage of oilfrom the several joints carries away dust which may have collected atthe edges of such joints and which might otherwise ultimately make itsway in between the bearing surfaces. The flange 29 protects the upperedge of sleeve 25 from the impact of stones falling from the crushingjaws.

It will be seen from the above description that a dust excluding deviceis provided which is durable and efficient and which is so lubricatedthat it offers substantially no resistance to the movement of the shaft.To those skilled in the art it will be apparent that the design andarrangement of the sev eral parts of the invention may be modified andthat the invention is not limited in its scope to the exact formillustrated and described in detail.

What I claim as my invention and desire to secure by Letters Patent is:

1. A gyratory crusher comprising in combination, a frame having acentral shaft socket at its lower end and an annular upwardly facingbearing surface encircling the socket, a gyratory shaft having its lowerend supported in said socket, means for preventing the entrance of dustand dirt into said socket around the shaft including a ring slidablyresting on the annular bearing surface of the frame and encircling theshaft, and a member movable with the shaft and having a dust-tight litagainst the ring.

2. A gyratory crushing machine comprising in combination, a frame havinga cen tral shaft socket at its lower end and an annular upwardly facingbearing surface oncircling the socket, a gyratory shaft having its lowerend supported in said socket and adapted to gyrate about a point withinthe socket, means for preventing the entrance of dust and dirt into saidsocket between the shaft and the wall of the socket including a ringslidably resting on the annular hearing surface of the frame andencircling the shaft, said ring having a spherical upper surface, and amember movable with the shaft and having a spherical lower surfacemaking a dust-tight fit against the ring.

3 A gyratory crusher comprising in combin "on, a frame having a centralshaft socket at its lower end and an annular updirt into said socketaround the shaft ineluding a ring slidably resting on the annularbearing surface of the fran'ie and encircling the shaft, and a membermovable with the shaft and having a dust-tight [it against the ring,said member being movable longitudinally of the shaft.

4;. A gyratory crusher comprising in combination, a frame having acentral shaft socket at its lower end and an annular upwardly facingbearing surface encircling the socket, a gyratory shaft having its lowerend supported in said socket, and means for preventing the entrance ofdust and dirt into said socket around the shaft including a ringslidably resting on the annular hearing surface of the frame andencircling the shaft, a member movable with the shaft and having adust-tight lit against the ring, and means secured to the shaft forprotecting the upper end of said. member.

5. A gyratory crusher comprising in con bination, a frame having acentral shaft socket at its lower end and an annular upwardly facingbearing surface encircling the socket, a gyratory shaft having its lowerend supported in said socket, and means for preventing the entrance ofdust and dirt into said socket around the shaft including a ring restingon the annular bearing surface of the frame and encircling the shaft,said ring being movable relatively to said shaft and frame, and a membermovable with the shaft and having a dust-tight fit against the ring.

6. A gyratory crusher comprising in combination, a frame having acentral shaft socket at its lower end and an annular upwardly facingbearing surface encircling the socket, a gyratory shaft having its lowerend supported in said socket, means for preventing the entrance of dustand dirt into said socket around the shaft and the wall of the socketincluding a ring slidably resting on the annular bearing surface of theframe and encircling the shaft, a member movable with the shaft andhaving a dust-tight iit against the ring, and a cap on said shaft havinga laterally extending flange to protect the upper end of said memberagainst falling rock.

7. A gyratory crusher including in combination, a frame having a centralshaft socket at its lower end, a gyratory shaft having its lower endsupported in said socket, means resting on the frame and encircling theshaft for preventing entrance of dust and dirt into the socket aroundthe shaft, and a member rigid withthe shaft encircled by said dustexcluding means, and having an annular flange portion encircling theshaft and positioned above said dust excluding means to protect the sameagainst damage from falling rock.

8. A gyratory crusher including in combination, a frame having a centralshaft socket at its lower end, a gyrat-ory shaft, a cap on the lower endof the gyratory shaft within the socket, said cap extending upwardly toenclose the lower end of the shaft and provided at its upper end with anannular laterally extending protecting flange, and means positionedbetween the socket and said flange and protected by the latter againstfalling rock, for preventing the entrance of dust and dirt intothe-socket around said cap.

9. A gyratory crusher including in comloination, a frame having acentral shaft socket at its lower end, a gyratory shaft, a cap on theloWer end of the shaft within the socket and extending upwardly out ofthe same, said cap having a flange at its upper end with an annularportion trans verse to the shaft, and a depending cylindrical portioncoaxial with the shaft, and means for preventing the entrance of dustand dirt into the socket around the cap which means includes acylindrical member slidable longitudinally of the cap, the upper end ofwhich lies under and is pro tected by the flange of said cap.

In testimony whereof I hereunto affix my signature.

WILLIAM S. WESTON.

